* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: linear-gradient(135deg, #89f7fe, #66a6ff);
  color: #023e8a;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  text-align: center;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  
}

body.dark {
  background: linear-gradient(135deg, #03045e, #023e8a);
  color: #caf0f8;
}

h1 {
  margin: 1rem 0;
  font-size: 2.5rem;
  letter-spacing: 2px;
}

.controls, .scoreboard {
  margin: 1rem 0;
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

label {
  font-weight: bold;
}

select, input[type="checkbox"] {
  transform: scale(1.2);
}

.container {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 2rem 0;
}

.game {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-template-rows: repeat(3, 100px);
  gap: 15px;
}

.box {
  font-size: 2.5rem;
  background: #48cae4;
  border: 3px solid #0077b6;
  border-radius: 15px;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.box:hover:not(:disabled) {
  transform: scale(1.05);
  background: #90e0ef;
}

.box:disabled {
  background: #caf0f8;
  cursor: not-allowed;
}

.box.win {
  background: #00b4d8 !important;
  color: #fff;
  border-color: #0077b6;
}

#reset-btn, #newGame-btn {
  margin: 1rem;
  padding: 0.75rem 1.5rem;
  font-size: 1.1rem;
  cursor: pointer;
  border: none;
  border-radius: 50px;
  background: #0077b6;
  color: #fff;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transition: background 0.3s ease;
}

#reset-btn:hover, #newGame-btn:hover {
  background: #023e8a;
}

#msg {
  font-size: 2rem;
  margin-top: 1rem;
  font-weight: bold;
}

.msg-container {
  padding: 1rem;
}

.hide {
  display: none;
}

.scoreboard p {
  font-size: 1.1rem;
  background: rgba(255,255,255,0.3);
  padding: 0.5rem 1rem;
  border-radius: 30px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

@media(max-width: 600px) {
  .game {
    grid-template-columns: repeat(3, 80px);
    grid-template-rows: repeat(3, 80px);
    gap: 10px;
  }
  .box {
    font-size: 2rem;
  }
}